方法调用崩溃“无法执行活动的方法”

Question

我试图从我的Android应用程序实现登录系统到存储在MS SQL Server 2008中的数据库。与服务器的连接工作，问题出现时我调用logIn方法让用户在连接助手类上进行连接来比较密码匹配。

这是当点击登录按钮时执行的功能：在连接器类

public void onLogInButtonClicked(View v){ 
     final EditText login = (EditText) findViewById(R.id.login); 
     final EditText password = (EditText) findViewById(R.id.password); 

     String userName = login.getText().toString(); 
     String pass = password.getText().toString(); 
     System.out.println("Pass Entered:" + pass); 
     System.out.println("User Entered" + userName); 


     if (connector.logIn(userName, pass)){ 

      //Creates Intent from new Activity to be launched 
      Intent k = new Intent(this, MainActivity.class); 

      //Sends login name to activity k 
      k.putExtra("loginName", userName); 
      //Starts new Activity 
      startActivity(k); 


     } 
     else 
     { 
      //toast log in unsuccessful 
     } 
    } 

登录方法如下：

boolean logIn(String name, String password){ 
     System.out.println("I'm in LogIn method"); 
     java.sql.ResultSet result = null; 
     boolean log = false; 
     try { 
      connection = this.getConnection(); 
      if (connection != null) { 

        //String for the login query 
        String statement = "SELECT Password FROM Users WHERE UserName = '" 
            + name + "'";  
        System.out.println(statement); 

        Statement select = connection.createStatement(); 
        result = select.executeQuery(statement); 
        System.out.println(result.getString(1)); 
        if(result.getString(1) == password) log = true; 

        result.close(); 
        result = null; 
        closeConnection(); 
      } 
      else { 
        System.out.println("Error: No active Connection"); 
        return log; 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
      } 
     return log; 
    } 

我甚至不能看到“我在登录方法”在控制台，这让我猜测应用程序崩溃之前进入它，虽然崩溃发生在该方法被调用的行。

这里是日志：

04-25 23:32:45.855: E/AndroidRuntime(795): FATAL EXCEPTION: main 
04-25 23:32:45.855: E/AndroidRuntime(795): java.lang.IllegalStateException: Could not execute method of the activity 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.view.View$1.onClick(View.java:2144) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.view.View.performClick(View.java:2485) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.view.View$PerformClick.run(View.java:9080) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.os.Handler.handleCallback(Handler.java:587) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.os.Looper.loop(Looper.java:123) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-25 23:32:45.855: E/AndroidRuntime(795): at java.lang.reflect.Method.invokeNative(Native Method) 
04-25 23:32:45.855: E/AndroidRuntime(795): at java.lang.reflect.Method.invoke(Method.java:507) 
04-25 23:32:45.855: E/AndroidRuntime(795): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-25 23:32:45.855: E/AndroidRuntime(795): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-25 23:32:45.855: E/AndroidRuntime(795): at dalvik.system.NativeStart.main(Native Method) 
04-25 23:32:45.855: E/AndroidRuntime(795): Caused by: java.lang.reflect.InvocationTargetException 
04-25 23:32:45.855: E/AndroidRuntime(795): at java.lang.reflect.Method.invokeNative(Native Method) 
04-25 23:32:45.855: E/AndroidRuntime(795): at java.lang.reflect.Method.invoke(Method.java:507) 
04-25 23:32:45.855: E/AndroidRuntime(795): at android.view.View$1.onClick(View.java:2139) 
04-25 23:32:45.855: E/AndroidRuntime(795): ... 11 more 
04-25 23:32:45.855: E/AndroidRuntime(795): Caused by: java.lang.NullPointerException 

提前感谢！

Answer 1

声音像连接器对象为空。你忘了初始化它或不正确的范围？如果连接器初始化不足以帮助您找到它，请将其发送到连接器的初始位置